I'm trying to develop better writing habits, and a thing I've always needed to get better at is just vomiting out words without thinking too hard about them. I've joined a few writing prompt communities, and I'm trying to start my writing sessions with a warmup--I open up Write Or Die
and spend 15 minutes doing my best to keep going so that the screen doesn't turn red.
It's working pretty well to get the words out, but now what I need to work on is not caring
so damn much about what I'm writing. The purpose of the exercise is just to warm up, to limber up my creative muscles so I can get down to my actual work, but each time I do it, I finish with a sense of incompleteness. I want to refine and build on the warmup, turn it into an actual fic. Not that that's a bad thing--I'm definitely saving everything so I can work on it later if I want to--but it's not what I'm going for.
Practice. Just have to keep practicing. Keep doing the warmups, and over time I'll accumulate a wealth of half-formed fics that I can work on someday when I'm lacking inspiration. It's a good habit that has a good side effect.